pub async fn begin_distributed_read(
__arg0: Extension<Arc<ServerState>>,
__arg1: Extension<RequestContext>,
__arg2: Json<DistributedReadRequest>,
) -> ResponseExpand description
Reject an explicit distributed-read request when this server has no registered fenced range-read coordinator. This route intentionally does not call the legacy local SQL route: capability absence is observable and classified before a query can produce local rows.